Scientists have debunked a claim by US President Donald Trump about a common painkiller causing autism.

Trump said that women should not take acetaminophen, known by the brand name Tylenol in the US or as paracetamol in Australia, "during the entire pregnancy" because it could cause the neurodevelopmental disorder.

At the time, experts said the link was unproven and the drug safe to use, and Australian scientists have now also dismissed the theory in a new study.

Existing evidence does not clearly link paracetamol use during pregnancy with autism or ADHD in children, the authors from Monash University found.

Women should continue to take it if they need it, the review, published in the BMJ, says.

 The researchers say confidence in the findings of existing evidence reviews an

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